786 



THE JOURNAL OF GEOLOGY. 



time did not permit me to make more full and critical obser- 

 vations. 



This glacier terminates on the steep terrace face shortly 

 before reaching the axis of the Blase valley, and does not 

 develop as distinct a terminal moraine as the two lower glaciers. 

 The lateral moraines maintain great strength down to the termi- 

 nal curvature, and in some degree close in at the end of the 

 glacier. The terminal face of the ice is steep, but not vertical. 

 Debris embraced in the lower part of the ice comes to the sur- 

 face on this terminal slope as in the preceding cases, but apart 



Fig. 13. — View of the Circumvallate glacier, with the Upper Blase Dale glacier 

 and its lateral moraine in the foreground. 



from this and the lateral and medial moraines, the surface is 

 generally free from rocky material. 



A circumvallate glacier. — Just north of the Upper Blase Dale 

 glacier, and almost overhanging it, is an interesting little glacial 

 lobe, snugly walled in by a sharp, serrate terminal moraine. 

 This will be seen in the central part of Fig. 13, in the saddle be- 

 tween the prominences at the right and left. The view was 

 taken from the south side of the Upper Blase Dale glacier. It 

 is notable chiefly for the sharpness and symmetry of the moraine, 

 and the contrast between it and the rocky surface around it. 

 Outside of this moraine on the right, it will be observed, there 

 is a wind drift accumulation of snow. This is of little moment 



